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uropygial gland
u·ro·py·gi·al gland (plural u·ro·py·gi·al glands)


noun 
Definition:
 
oil gland in birds: a gland in the skin at the base of the tail of most birds that secretes an oil used while preening to condition and waterproof the feathers
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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